Troy, I am taking my Vibrandoneon to an accordion repair shop here in Los Angles to get it tuned up. I have a couple of notes out of tune on the soprano register when played with the Alto register. This just started about a week ago. Not sure how it happened but I will have them also look at the air chamber to see if I have any leaks. Maybe this will help with circular breathing on it. As for my Clavietta, even though I changed the gasket and new rubber washers it still runs out of air, not as much but as before I changed the gasket but still some. My Hammond is super tight and can circular breath for a long time. By the way I have a Hammond Hyper on the way and will do a comparison on both the 44 and HP for the site when I have a little time with it.